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1908. 2013-03-14T15:55:13Z. 2013-03-14T15:55:13Z. Todd, J. E. (James Edward), 1846-1922. The Survey. English. Public. South Dakota, Clay County, Union County, Nebraska, Dakota County, Dixon County, Iowa, Plymouth County, Sioux County, États-Unis, and Dakota du sud.
1973. 2018-04-20T19:01:57Z. 2018-09-05T19:39:35Z. Horick, Paul J. Iowa Geological Survey. English. cartographic image. Public. Iowa and Iowa.